大神看看,为什么飞机不会动.

运行,按下上键等,无反应.
求解决.
以下代码.

package cn.sst;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;

public class GameUtil {
    // 工具类最好将构造器私有化。
    private GameUtil() {

    }

    public static Image getImage(String path) {
        BufferedImage bi = null;
        try {
            URL u = GameUtil.class.getClassLoader().getResource(path);
            bi = ImageIO.read(u);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bi;
    }
}

package cn.sst;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class MyGameFrame extends JFrame {
    Image bgImg = GameUtil.getImage("images/bg.jpeg");
    Image planeImg = GameUtil.getImage("images/plane.png");
    Plane plane =new Plane(planeImg,250,250,5);



    private Image offScreenImage = null;

    public void update(Graphics g) {
        if(offScreenImage == null)
            offScreenImage = this.createImage(500,500);//这是游戏窗口的宽度和高度

        Graphics gOff = offScreenImage.getGraphics();
        paint(gOff);
        g.drawImage(offScreenImage, 0, 0, null);
    }

    public void paint(Graphics g) {

        g.drawImage(bgImg, 0, 0, null);
        plane.drawSelf(g);




    }

    public static void main(String[] args) {
        MyGameFrame f = new MyGameFrame();
        f.launchFrame();
    }
    public void launchFrame() {

        this.setTitle("123");

        this.setVisible(true);
        this.setSize(600, 600);
        this.setLocation(700, 300);
        ////增加关闭窗口监听，这样用户点击右上角关闭图标，可以关闭游戏程序
        this.addWindowListener(new WindowAdapter() {
            public void Windowclosing(WindowEvent E) {
                System.exit(0);
            }
        });
        new PaintThread().start();
    }
    class PaintThread extends Thread {
        public void run() {
            while (true) {
                repaint();
                try {
                    Thread.sleep(40); //1s = 1000ms
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            }
        }
    }
   class KeyMonitor extends KeyAdapter{//定义键盘
       @Override public void keyPressed(KeyEvent e) {
          plane.adddirection(e);
       }

       @Override public void keyReleased(KeyEvent e) {
           plane.minusdirection(e);
       }
   }

}

`

package cn.sst;

import java.awt.*;

public class GameObject {
    Image img;
      double x,y;
      int speed;
     int  width,height;

    public void drawSelf(Graphics g) {
        g.drawImage(img,(int)x,(int)y,null);

    }
    public GameObject(Image img, double x, double y, int speed, int width, int height) {
        super();
        this.img = img;
        this.x = x;
        this.y = y;
        this.speed = speed;
        this.width = width;
        this.height = height;
    }
    public GameObject(Image img, double x, double y) {
        this.img = img;
        this.x = x;
        this.y = y;
    }
    public GameObject(Image img, double x, double y, int speed) {
        this.img = img;
        this.x = x;
        this.y = y;
        this.speed = speed;
    }
    public GameObject() {
    }
}





![图片说明](https://img-ask.csdn.net/upload/201904/29/1556542340_634406.png)

![图片说明](https://img-ask.csdn.net/upload/201904/29/1556542351_280821.png)

我看你定义了KeyMonitor继承键盘监听，可是你在哪里使用了呢？
没有使用当然没有反应，而且代码也没发全还有没有别的问题还不知道。